Amphastar Pharmaceuticals (AMPH) Stock Chart & Stock Price History $26.62 +0.63 (+2.42%) Closing price 06/9/2025 04:00 PM EasternExtended Trading$26.62 +0.00 (+0.02%) As of 06/9/2025 07:45 PM Eastern Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Polygon.io. Learn more. Add Compare Share Share Chart Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestSustainabilityTrendsBuy This Stock Amphastar Pharmaceuticals Stock Price Performance The Amphastar Pharmaceuticals (AMPH) stock chart highlights key performance trends across multiple timeframes. Over the last 12 months, the stock's price has decreased 36.07%, with a year-to-date return of -28.31%. In the past month, the stock has increased 10.41%, reflecting recent market activity. As of the latest close, Amphastar Pharmaceuticals traded at $26.62 with a market cap of $1.25 billion and volume of 514,479 shares. Five years ago, the stock traded at $20.54, representing a 29.60% increase over that period. At the time, it had a market cap of $901.79 million and a volume of 689,300 shares. Receive AMPH Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Amphastar Pharmaceuticals and its competitors with MarketBeat's FREE daily newsletter. Email Address 5 Day Performance+4.31%1 Month Performance+10.41%3 Month Performance-6.30%Year-To-Date Performance-28.31%1 Year Performance-36.07%5 Year Performance+29.60% AMPH Stock Chart for Tuesday, June, 10, 2025 AMPH Chart by TradingView Amphastar Pharmaceuticals Stock Price History Daily Weekly Monthly Yearly Time Frame Custom Range 1 Month 3 Months 6 Months Year-to-Date 1 Year 3 Year 5 Year Time Frame * Start Date * End Date Export to Excel DateOpening PriceClosing PriceHighLowVolumeMarket Capitalization06/09/2025$25.99$26.62+2.42%$26.86$26.10514,479 shs$1.25 billion06/06/2025$25.52$25.99+1.84%$26.02$25.53359,174 shs$1.23 billion06/05/2025$25.86$25.52-1.31%$25.91$25.19555,155 shs$1.20 billion06/04/2025$26.01$25.86-0.58%$26.57$25.76395,476 shs$1.22 billion06/03/2025$25.38$26.01+2.48%$26.17$25.13526,254 shs$1.23 billion06/02/2025$25.88$25.38-1.93%$26.05$25.26656,448 shs$1.20 billion05/30/2025$25.64$25.88+0.94%$25.92$25.15460,917 shs$1.23 billion05/29/2025$25.26$25.64+1.50%$25.79$25.18524,687 shs$1.22 billion05/28/2025$25.53$25.26-1.06%$25.69$25.12476,324 shs$1.20 billion05/27/2025$24.47$25.53+4.33%$25.72$24.81532,528 shs$1.21 billion Get the Latest News and Ratings for AMPH and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Amphastar Pharmaceuticals and its competitors with MarketBeat's FREE daily newsletter. 05/26/2025$24.47$24.47$24.49$23.74548,566 shs$1.16 billion05/23/2025$24.20$24.47+1.12%$24.49$23.74548,566 shs$1.16 billion05/22/2025$24.16$24.20+0.17%$24.39$23.93360,874 shs$1.15 billion05/21/2025$25.07$24.16-3.63%$24.84$24.15341,425 shs$1.15 billion05/20/2025$24.79$25.07+1.13%$25.24$24.67482,087 shs$1.19 billion05/19/2025$24.86$24.79-0.28%$24.93$24.43359,036 shs$1.18 billion05/16/2025$24.32$24.86+2.22%$24.90$24.20510,253 shs$1.18 billion05/15/2025$23.30$24.32+4.38%$24.70$23.20667,744 shs$1.16 billion05/14/2025$23.88$23.30-2.43%$23.97$23.27578,020 shs$1.11 billion05/13/2025$24.34$23.88-1.89%$24.42$23.77444,961 shs$1.13 billion05/12/2025$24.11$24.34+0.95%$24.57$23.60563,773 shs$1.16 billion05/09/2025$24.65$24.11-2.19%$25.03$23.30790,220 shs$1.15 billion Related Companies PCVX Stock Chart MRUS Stock Chart RYTM Stock Chart AKRO Stock Chart RNA Stock Chart PTCT Stock Chart CYTK Stock Chart SRPT Stock Chart KRYS Stock Chart ACAD Stock Chart Receive AMPH Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Amphastar Pharmaceuticals and its competitors with MarketBeat's FREE daily newsletter. 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